Staffan,

Kerker Staffan wrote:

...

   

Now, if I disable one of the Gateways, I hang every second call. OpenSER does

not

try the second A record address if the first doesn't answer. How can I solve

this? Shouldn't OpenSER fail over to the second A record listed in the NAPTR

=> SRV

resolving? Or will OpenSER continue to resend all SIP INVITES until timers

fire? Would

it help if the proxy recieved an ICMP port/destination unreachable from the

network? Is

there anyway to get around this? In the other direction, from POTS to sip,

the PGW2200

nicely switches over to the second of my two OpenSER servers if I shut one of

them down. These servers have the same DNS entries (but for another SIP domain, NAPTR =>

SRV => 2x A record).

      

Yes, OpenSER or for that matter every transaction stateful proxy should

do RFC 3263 based fail-over. But as you can imagine this is pretty

complex to implement and that's why openser does not support it yet, it

is listed on the development roadmap. The newest release of SER does

support DNS failover.